D4.1 - Radio Frequency-Based Determination of the Oxygen Loading of Automotive Three-Way Catalysts

S. Reiß, G. Fischerauer & R. Moos
To keep three-way catalysts (TWC) for gasoline engine exhaust gas aftertreatment in an optimal range for pollutant conversion, an additional oxygen storage (ceria-zirconia) component is added to the catalyst coating. It acts as an oxygen buffer to compensate for deviations from the stoichiometric operation mode, e.g. during acceleration. Presently, one evaluates the signals of lambda probes upstream and downstream of the TWC and estimates the current degree of oxygen loading. The electrical conductivity of ceria-zirconia...